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If electrons have less mass than planck mass do they still exert gravitational force? What about atoms and other subatomic particles with mass?

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We don't know of any reason why they shouldn't. But we don't know for sure, because the gravitational field produced by a Planck-mass object is too small to measure directly. The lightest object I know of whose gravitational field has been directly measured was 706 mg (http://jetp.ac.ru/cgi-bin/dn/e_067_10_1963.pdf), which is still 35,000 times the Planck mass.

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